Circuit Testers | McMaster-Carr

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197 Products

About Safety Ratings for Electrical Testing

Receptacle Testers

Plug these testers into electrical receptacles to confirm proper wiring.

Circuit Tracers

Locate cables behind walls, check for continuity, and identify circuit breakers.

Line Break Detectors

Check continuity in circuits.

Circuit Breaker Identifiers

Identify the circuit breaker connected to an electrical receptacle.

Voltage Detectors

Confirm that voltage is present in receptacles, cables, and other electrical components.

High-Voltage Detectors

Safely check for the presence of voltage in high-voltage equipment and lines. This noncontact detector checks for voltage by sensing electrostatic fields when brought near the electrical component.

Multimeters

Pen-Style Multimeters

The smallest digital multimeter we offer. This meter is a portable and convenient way to perform various electrical tests.

Electronic-Component Testing Meters

This meter manually adjusts to the low ranges needed for testing electronic components such as circuit boards and diodes.

Data-Logging Multimeters

Identify intermittent issues such as voltage spikes and temporary power flow problems—this meter records measurements from electrical tests over time. Review data in real time or save it for future analysis.

Tweezer-Style Electronic-Component Testers

Grasp tiny components on circuit boards and other electronic systems in order to test, identify, and troubleshoot them.

Pocket-Size Multimeters

Perform a variety of electrical tests with a multimeter that fits in your pocket.

Fluke Wireless Remote-Reading Multimeters

A wireless connection transmits electrical measurements from the multimeter to a separate display, so you can take measurements in hard-to-reach or potentially dangerous locations. Fluke multimeters are known for quality and durability.

High-Accuracy Multimeters

For measurements at least twice as accurate as standard digital multimeters, choose this multimeter.

Fluke Multimeters

Rely on the quality and durability of a Fluke multimeter when taking voltage, resistance, and other electrical measurements.

Fluke Instrumentation Process Control Multimeters

With this combination loop calibrator and multimeter, check for current control loop issues in PLCs, motors, and fans in addition to taking other electrical measurements. When used as a loop calibrator, the current input as well as the percentage of the input scale is shown on the dual display, giving you quick diagnostic information. Fluke is known for quality and durability.

Fluke Insulation Testing Multimeters

Check insulation quality in electrical equipment such as motors and power tools. You can also take other electrical measurements with these Fluke multimeters, known for quality and durability.

Multimeters

Take current, voltage, resistance, and other electrical measurements.

Simpson Analog Multimeters

The analog display shows the magnitude and rate of change more easily than a digital multimeter when measuring rapidly changing electrical values. Simpson multimeters are known for their ruggedness and reliability.

Fluke Data-Logging Multimeters

Record measurements from electrical tests over time to identify intermittent issues such as voltage spikes and temporary power flow problems. Review data captured by these high-quality and durable Fluke multimeters in real-time or save it for future analysis.

Analog Multimeters

Measure rapidly changing electrical values with an analog display that shows the magnitude and rate of change more easily than a digital multimeter.

Water-Resistant Multimeters

Perform electrical tests in washdown environments. These multimeters have an IP67-rated housing.

Fluke Water-Resistant Multimeters

For taking electrical measurements in washdown environments, choose the durability and quality of a Fluke multimeter with an IP67-rated housing.

Fluke High-Accuracy Multimeters

These Fluke multimeters provide results at least twice as accurate as standard Fluke multimeters. Fluke is known for quality and durability.

Open-Jaw Multimeters

Fluke Open-Jaw Multimeters

Run a cable through the open jaw to test current without interrupting the circuit. These multimeters are especially useful for high current measurements and include test leads to perform other electrical tests. Fluke multimeters are known for quality and durability.

Fluke Clamp-On Multimeters

Jaws surround a cable to test current without interrupting the circuit, making these high-quality, durable Fluke multimeters especially useful for testing high current. They include test leads to perform other electrical tests.

Clamp-On Multimeters

Suitable for testing high current, these multimeters have jaws that surround a cable to test without interrupting the circuit. They include test leads to perform other electrical tests.

Analog Clamp-On Multimeters

Measure rapidly changing electrical values more easily than with a digital multimeter. Convenient for taking frequent high current measurements, the meter has jaws that surround a cable to test current without interrupting the circuit. Use the included test leads to perform other electrical tests.

Current Detectors

Check for the presence of AC current and voltage without making direct contact with a wire.

Data Cable Identifiers

Trace unshielded data and telephone cables to their source.

Test Leads

Fluke Test Lead Sets

Connect to Fluke multimeters with a set of red and black test leads.

Fluke Probe Tips

Adapt Fluke test leads to perform electrical tests in tight spaces.

Fluke Test Lead Kits

These kits include a set of red and black Fluke test leads with a variety of interchangeable tips.

Current-Sensing Test Leads

Measure current without interrupting the circuit by connecting these test leads to a multimeter or current meter.

Test Leads

Replace a test lead or complete a set with a red or black lead.

Build-Your-Own Test Leads

Choose your own combination of test lead tips and cords.

Test Lead Sets

Pairs of red and black test leads are ready to connect to a multimeter or other electrical test equipment.

Test Lead Kits

Perform electrical tests with a set of red and black test leads and interchangeable tips.

Test Leads with Reel

Extend the distance between your multimeter and the equipment you’re testing.

Through-Panel-Mount Connectors

Before making a permanent connection, use these connectors to test a circuit. Also known as binding posts, they mount through panels to create a connection point.